# What is blockspace?

The capacity of Bitcoin's blocks, as the block.space documents define and BTI measures it.

URL: https://blockspace.wiki/answers/what-is-blockspace/

In the block.space documents, [blockspace](https://blockspace.wiki/glossary/blockspace/) is the capacity of Bitcoin's blocks, consumed by transactions. [Blockspace Value Theory](https://blockspace.wiki/glossary/bvt/) calls it "a socially constructed commodity built on top of a protocol-enforced constraint" and argues it exists only while a block is being built. [BTI](https://blockspace.wiki/glossary/bti/) measures what was consumed: every byte of every transaction, counted exactly, from the genesis block forward.

Sources:

- Blockspace Value Theory · https://block.space/docs/bvt
- block.space docs: Blockspace Value Theory · https://block.space/docs/bvt
- block.space docs: BTI · https://block.space/docs/bti

Updated: 2026-10-20